Insulin Is Produced by the Body When Sugar Is Ingested

Insulin is produced by the body when sugar is ingested. Research has found that insulin starts being produced just when sugar is put on the tongue-before it actually gets into the stomach and, ultimately, the bloodstream. In this scenario, the production of insulin after sugar enters the stomach and bloodstream would be a(n) :

A) conditioned stimulus.
B) conditioned response.
C) unconditioned stimulus.
D) unconditioned response.